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The walls of the infundibulum is markedly thickened. A linear structure, likely a thin membrane, was seen attached to the anterior wall of the thickened infundibulum and the ventricular side of the interventricular septum. Cine images show a narrow jet across the narrowed infundibulum consistent with a severe infundibular pulmonary stenosis. The main pulmonary trunk is dilated.
The left brachiocephalic vein does not join the right and is seen to course inferiorly as a persistent left superior vena cava that drains into the dilated coronary sinus.